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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e163ec47b5995ce1afb9c343c66e70438e759acba8780f4f1acb5e6056dfac' 
  AND token = 'TnNlmXOBUhhofIdU/QK8QoXrO5Z3BTuIDBiDzKiM2C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}